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United States Patent | 5,685,482 |
Sickles | November 11, 1997 |
Induction charging apparatus for HVLP spray guns and air-assisted airless spray guns includes an air cap having a central orifice for receiving a spray gun nozzle. The cap includes one or more charging electrodes adjacent the orifice and carrying a voltage sufficiently large to induce on the spray droplets charges of a polarity opposite to that on the electrodes. A rotatable electrical connector enables the cap to rotate 360.degree. while maintaining electrical connections between the electrodes and a power supply. The spray gun nozzle is an airless nozzle receiving liquid at a pressure of about 1,000 psi and having a spray tip from which liquid is sprayed along a flow path coaxial with the electrodes. Air at less than about 10 psi is directed along the flow path to assist in the atomization of the liquid from the airless nozzle.
Inventors: | Sickles; James E. (21889 Potomac Dr., Southfield, MI 48076) |
Appl. No.: | 425737 |
Filed: | April 20, 1995 |
Current U.S. Class: | 239/3; 239/296; 239/300; 239/416.5; 239/522; 239/690.1; 239/698; 239/705; 239/707 |
Intern'l Class: | B05B 005/043 |
Field of Search: | 239/3,690,690.1,697-700,702-708,290,296,300,301,416.5,417,522,523 |
2302185 | Jul., 1942 | Campbell. | |
2766064 | Oct., 1956 | Schweitzer | 239/699. |
3093309 | Jun., 1963 | Watanabe. | |
3371145 | Feb., 1968 | Senay. | |
3408985 | Nov., 1968 | Sedlacsik. | |
3425625 | Feb., 1969 | Probst. | |
3653592 | Apr., 1972 | Cowan. | |
3677470 | Jul., 1972 | Probst et al. | 239/707. |
3698634 | Oct., 1972 | Hamilton. | |
3737090 | Jun., 1973 | Wech. | |
3767115 | Oct., 1973 | Kozinski et al. | |
3815820 | Jun., 1974 | Probst. | |
3843052 | Oct., 1974 | Cowan. | |
3907202 | Sep., 1975 | Binoche. | |
3937401 | Feb., 1976 | Luderer et al. | |
4002777 | Jan., 1977 | Juvinall et al. | 239/3. |
4009829 | Mar., 1977 | Sickles | 239/690. |
4055300 | Oct., 1977 | Binoche. | |
4073002 | Feb., 1978 | Sickles et al. | 239/690. |
4106697 | Aug., 1978 | Sickles et al. | |
4120017 | Oct., 1978 | Sickles. | |
4186886 | Feb., 1980 | Sickles | 239/690. |
4214709 | Jul., 1980 | Scull et al. | |
4219157 | Aug., 1980 | Binoche. | |
4232824 | Nov., 1980 | Binoche. | |
4238077 | Dec., 1980 | Hori. | |
4245784 | Jan., 1981 | Garcin. | |
4248386 | Feb., 1981 | Morle. | |
4255777 | Mar., 1981 | Kelly. | |
4258655 | Mar., 1981 | Bagby et al. | |
4258885 | Mar., 1981 | Legeza. | |
4266721 | May., 1981 | Sickles | 239/3. |
4290091 | Sep., 1981 | Malcolm. | |
4313968 | Feb., 1982 | Sickles et al. | |
4331298 | May., 1982 | Bentley et al. | |
4341347 | Jul., 1982 | DeVittorio. | |
4341815 | Jul., 1982 | Bagby et al. | |
4343433 | Aug., 1982 | Sickles | 239/3. |
4347984 | Sep., 1982 | Sickles | 239/690. |
4355764 | Oct., 1982 | Rood et al. | |
4377603 | Mar., 1983 | Itoh et al. | |
4381533 | Apr., 1983 | Coffee. | |
4440349 | Apr., 1984 | Sickles. | |
4476515 | Oct., 1984 | Coffee. | |
4572438 | Feb., 1986 | Traylor. | |
4598871 | Jul., 1986 | Hartle. | |
4611762 | Sep., 1986 | Turner et al. | |
4613075 | Sep., 1986 | Owen. | |
4721255 | Jan., 1988 | Lind | 239/690. |
4745520 | May., 1988 | Hughey. | |
4752034 | Jun., 1988 | Kuhn et al. | |
4761299 | Aug., 1988 | Hufstetler et al. | |
4819879 | Apr., 1989 | Sharpless et al. | |
4842203 | Jun., 1989 | Kuhn et al. | 239/708. |
4911367 | Mar., 1990 | Lasley | 239/707. |
4915303 | Apr., 1990 | Hufgard. | |
5044564 | Sep., 1991 | Sickles | 239/690. |
5090619 | Feb., 1992 | Barthold et al. | 239/417. |
5090623 | Feb., 1992 | Burns et al. | |
5178330 | Jan., 1993 | Rodgers. | |
5188290 | Feb., 1993 | Gebauer et al. | |
5222663 | Jun., 1993 | Noakes et al. | 239/690. |
Foreign Patent Documents | |||
1125358 | Jun., 1982 | CA | 239/690. |
Improving Liquid Spray Transfer Efficiency, Glen L. Muir, Graco Inc. Minneapolis, MN Mar. 1995, pp. 63-67. Spraying Water-Borne Coating Electrostatically, Jim Scharfenberger, Manager, Process Tech., Indianapolis, IN, Jan. 1989, pp. 48-56. Should You Consider Air-Assisted Airless Spray?, Mike Osborne and John Treuschel, The DeVilbiss Co., Toledo, OH, Jan. 1989, pp. 59-64. Trends in Electrostatic Hand Guns, David c. Burdakin, Product Manager Ransburg Electrostatic Equipment, Inc. Indianapolis, IN, Mar. 1987, pp. 86-93. Spray Painting Equipment, Products Finishing, Mar. 1987, pp. 79-85. Charge to Mass Distributions in Electrostatic Sprays, T.C. Anestos, J.E. Sickles, R.M. Tepper, IEEE Transaction on Industry Applications, vol. IA-13, No. 2, Mar./Apr. 1977, pp. 168-177. Specific Charge Measurements in Electrostatic Air Sprays, J.E. McCarthy, Jr. and D.W. Senser, Thermal Sciences and Propulsion Center School of Mechanical Engineering, Purdue University, West Lafayette, IN, pp. 1-6. Electrostatic Atomisation of Conducting Liquids Using AC Superimposed on DC Fields. W. Balachandran, W. Machowski, and C.N. Ahmad, Dept. of Electronic and Electrical Engineering, University of Surrey Guildford, Surrey GU2 5XH, U.K., pp. 1369-1373. |